| article html file updated | 7 February 2020 04:33 CET | Update | https://www.mdpi.com/1999-4907/7/2/42 |
| article html file updated | 6 May 2019 00:21 CEST | Update | - |
| article html file updated | 26 March 2019 20:44 CET | Original file | - |
| article pdf uploaded. | 15 February 2016 11:38 CET | Version of Record | https://www.mdpi.com/1999-4907/7/2/42/pdf |
| article xml uploaded. | 15 February 2016 11:38 CET | Original file | https://www.mdpi.com/1999-4907/7/2/42/xml |
